Island



(No Model.)

W. P. BROWN.

DASH POT.

Patented May 21 l NV E UR.

NYGYYW. VTC oww.

WITNEEEEAE UNITED STATES PATENT OTEEICE.

TAI/PER F. BROIVN, OF PROVIDENCE, RIIODE ISLAND.

DASH-POT.

SPECIFICATION forming part of Letters Patent No. 403,643, dated May 21, 1889.

Application filed January 8, 1889. Serial No. 295,795. (No model.)

To all whom, t may concern:

Vlle it known that. I, lVALTER F. BROWN, a citizen of the United States,residing at Providence, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Connection-Joints for Vacuum Dash-Pots; and I do hereby declare the vfollowin g to be afull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters ortigures of reference marked thereon, which form a part of this specification.

A)Iy invention relates to vacuum dash-pots, but more especially tothe construction ot' the joint by which the drop-rod is attached to the plunger; and it consists, essentially, of a top plate or flange havin a well-rounded or globular-sh aped center portion, and an apertured cap recessed on its under side and concentric with the rounded center of the top plate, said cap and plate being so constructed and arranged that when they are secured to the plunger an annular space is formed between them. Into this space is fitted the lower end of the droprod, thereby forming a self-adjusting or cupshaped universal joint.

The object I have in view is to provide the drop-rods or connections for vacuum-pots with means whereby the wear at the joint is reduced to a minimum, yet at the saine time permitting the rod to vibrate freely in conformity with the angular movement ot" the valve-arm of the valve-gear.

My improvement is more particularly applicable to automatic cut-ott engines of the four-valve or Corliss type, such as are provided with releasing or detachable valve-gear.

In the annexed drawings, Figure l is a vertical central sectional view, in partial elevation, showing a vacuum dash-pot provided with my improved joint. Fig. 2 is a plan view, and Fig. is a view, of the drop-rod adapted at its lower end to engage the upper end of the plunger of the vacuum dash-pot.

The following describes more in detail the -construction and manner of operation of my improved joint.

A designates the drop-rod as a whole, adapted, by means of the box p at the upper end, to be jointed to a pin mounted on and vibrating with the valve-arm oi an engine, as usual. The lower end ot' the rod is enlarged, thereby forming the cup-shaped head In, thc cavity being indicated by c2. The forni of the lower head, n, is that of a portion (being less than half) ot' a hollow sphere, the shell being uniform in thickness throughout. The two end portions are connected bythe rod m, all as clearly shown in Figs. l and 3.

e indicates thehollow cylinder or stationary portion of the vacuum-valve casing, ot ordinary construction, the saine having an enlarged base, b', adapted to receive holdingdown bolts. The casing is also enlarged to form the open annular recess b3.

a designates the plunger or weight as a whole, the same as drawn having a tubular forni and turned out to tit the cylinderb. The lower portion of the plunger is extended radially to form the circular head a', which is fitted to move up and down in the annular recess b, all as common, and to which I make no claim. The upper end of the plunger is provided with a flange, a2, into which the capbolts are screwed. Immediately surmounting and counterbored into the cylinder b is located a flange-plate, c, the same having a spherical-shaped central projection, c, formed on its upper face, the describing radius of the said spherical projection being the same as that ot' the concavity c2 of the headn of the drop-rod, before described.

Upon the top ot' the flange-platee is located a dome-shaped cap, d, the under side ot' which is provided with a central spherical-shaped recess, the curvature ot' which is ot' the same radius as that of the exterior or upper surface of the drop-rod head n. rlhe parts c and d when in position produce an annular spherical-shaped recess, o, between them, as shown in Fig. l. The cap is further provided with an enlarged flange, the same being drilled to receive the cap-bolts s. A central opening', o, is cut TOO time being lifted vvithout producing sufficient lateral pressure or friction upon the parts a form, construction, and arrangement of the j nature in presence of two Wltnesses.

dash-pot as 4a Whole, except as to the means for connecting the drop-rod to the plunger.

I claim as my invention- The combination, with a drop-rod having a cup-shaped enlargement', n, at its lower end,

of an annular plunger, a, a ange-plate, c, f having a hemispherical projection formed on its upper side adapted to the cavity ofthe drop-rod, and a centrally-apertured hemlsphercal cap, d, having its under side connect- A ing with the said projection of the flange-plate c, and adapted to the convex surface of the endn of the drop-rod, said flange-plate and ,cap being secured to the topend of the l plunger, ,all arranged and adapted for operation substantially as shown and described.

In testimony whereof I have affixed my sig- WALT'ER F. BROWN.

Vitnesses:

CHARLES I-IANNIGNN, GEO. H. REr/IINGTON.l 

